Interval based actions with minimum external library

[rickkas7]

Yes, what Armor said. millis() is the best way to handle this, and make sure you structure it exactly like that:

if (millis() - lastTime >= interval)

This is necessary to make sure millis rollover does not cause problems:

Millis() and rollover tutorial

The millis() function is handy for timing things with the Particle Photon (and Electron, and Core). It executes very quickly and has a good resolution (milliseconds). From the manual: Returns the number of milliseconds since the device began running the current program. This number will overflow (go back to zero), after approximately 49 days. Note: The return value for millis is an unsigned long, errors may be generated if a programmer tries to do math with other datatypes such as ints. Now…